CN115153756B - Expander assembly suitable for self-expanding device - Google Patents

Abstract

The application provides an expander component suitable for a self-expanding device, which comprises a push rod, a shell, a push button and an expander, wherein the push rod is assembled in the shell in a sliding way, and the expander is correspondingly connected to the distal end of the push rod; the outside of push rod is equipped with the spacing groove, is equipped with the round hole that corresponds the spacing groove on the shell, is equipped with the knob in the round hole, and the knob corresponds the one end of push rod and inserts the spacing groove under the external force drive to lock the push rod. The push rod is used for driving the expander to move during operation, after the expander is driven to a designated position, the relative position of the expander is locked through the mutual locking of the knob and the limiting groove, the movement state and the position of the expander are controlled, and the controllability of the expander in the use process can be increased, so that uncontrollable sliding of the expander after entering a human body is prevented, and the damage to the vascular wall in the operation process is avoided.

Description

Expander assembly suitable for self-expanding device

Technical Field

The application belongs to the technical field of medical instruments, and particularly relates to an expander assembly suitable for a self-expanding device.

Background

Deep Vein Thrombosis (DVT) is a blood reflux disorder disease caused by abnormal coagulation, is a very dangerous disease, can cause bruise and pulmonary embolism, even has serious consequences such as shock, venous gangrene, death and the like, especially pulmonary embolism, when the thrombus falls off, the thrombus can enter pulmonary artery along blood flow to cause pulmonary embolism, and the acute pulmonary embolism is easy to misdiagnose and miss diagnosis, and has the death rate of 20 to 30 percent. According to a series of studies, the use of venous thrombolytic devices is a timely and effective treatment. The venous thrombus remover mainly establishes a passage through a catheter sheath and a dilator, sends a thrombus removing catheter system into a blood vessel, deploys the thrombus removing system, drags the thrombus removing catheter, pulls out the coagulated blood clot out of the body, and removes residual thrombus through a suction device. Compared with other thrombus taking modes, the vein thrombus taking device is easier to operate, shortens the operation time, has high treatment effectiveness, reduces the bleeding rate and reduces the pain degree of patients.

When the existing venous thrombus taking device in the market is clinically used, the existing venous thrombus taking device needs to be matched with an expander for fixing a sheath and hiding a self-expansion device at the tail end of the sheath, when venous thrombus taking is carried out, after the expander enters a human body, sliding is easy to occur, the release of the self-expansion device is affected, the damage to the vascular wall is easy to occur, and certain risks are brought to an operation.

Accordingly, there is a need to provide an improved solution to the above-mentioned deficiencies of the prior art.

Disclosure of Invention

It is an object of the present application to overcome the deficiencies of the prior art described above and to provide a dilator assembly suitable for use in a self-expanding device.

In order to achieve the above object, the present application provides the following technical solutions:

the expander assembly suitable for the self-expanding device comprises a push rod, a shell, a push button and an expander, wherein the push rod is slidably assembled in the shell, and the expander is correspondingly connected to the distal end of the push rod;

the outside of push rod is equipped with the spacing groove, be equipped with on the shell and correspond the round hole in spacing groove, be equipped with the knob in the round hole, under the external force drive the knob corresponds the one end of push rod inserts the spacing groove, in order to right the push rod locks.

Preferably, the number of the limiting grooves is two, the distance between the two limiting grooves is matched with the pushing distance of the pushing rod in the venous thrombosis operation, and the knob is switched between the two limiting grooves along with pushing of the pushing rod.

Preferably, a guide rail corresponding to the pushing rod is arranged on the inner wall of the shell, and a baffle corresponding to the guide rail is arranged on one side, away from the limiting groove, of the pushing rod;

when the baffle is blocked at the proximal end of the guide rail, the knob is opposite to the limit groove at the distal end;

when the baffle is stopped at the far end of the guide rail, the knob is opposite to the limit groove at the near end.

Preferably, the limit groove is perpendicular to the axial direction of the push rod, and the end part of the knob is provided with a plate-shaped end head corresponding to the plate-shaped end head.

Preferably, a stepped platform is arranged in the round hole, a limit column extending radially is arranged in the middle of the knob, and a spring positioned between the limit column and the stepped platform is sleeved on the knob, so that the knob has a driving force for moving towards the limit groove.

Preferably, the inner wall of the round hole is provided with a clamping plate corresponding to the limiting column, and the clamping plate is provided with a notch corresponding to the limiting column.

Preferably, a pushing handle is arranged at the proximal end of the pushing rod.

Preferably, the outer part of the expander, which extends out of the far end of the shell, is sleeved with a sheath pipe, and the sheath pipe is correspondingly connected with the far end of the shell through a sheath pipe joint;

a self-expanding device is arranged at the distal end of the dilator, the self-expanding device moves along with the dilator and is retracted into the sheath,

or the self-expanding device moves with the dilator out of the sheath and expands.

Preferably, the distal end of the housing is provided with an interface corresponding to the sheath tube joint, an annular protrusion is arranged outside the interface, the diameter of an inner hole of the sheath tube joint is gradually reduced in a direction corresponding to the distal end, and an annular groove corresponding to the annular protrusion is arranged at the distal end of the inner hole.

Preferably, the main body of the housing comprises two equal parts spliced with each other, and the equal parts are arranged on one equal part;

one of the equal parts is provided with a plurality of positioning holes, and the other equal part is correspondingly provided with a plurality of positioning pins.

The beneficial effects are that: the push rod is used for driving the expander to move during operation, after the expander is driven to a designated position, the relative position of the expander is locked through the mutual locking of the knob and the limiting groove, the movement state and the position of the expander are controlled, and the controllability of the expander in the use process can be increased, so that uncontrollable sliding of the expander after entering a human body is prevented, and the damage to the vascular wall in the operation process is avoided.

Drawings

The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application. Wherein:

FIG. 1 is a schematic illustration of a dilator assembly according to one embodiment of the present application;

FIG. 2 is a simplified cross-sectional view of a dilator assembly with a screw Niu Suo secured to a distal limit groove in accordance with one embodiment of the present application;

FIG. 3 is a simplified cross-sectional view of the dilator assembly with the knob locked to the proximal limit groove in accordance with one embodiment of the present application;

FIG. 4 is a schematic cross-sectional view of the portion A-A of FIG. 2 in accordance with one embodiment of the present application;

FIG. 5 is a schematic view of the internal structure of a dilator assembly according to one embodiment of the present application;

FIG. 6 is a schematic view showing the internal structure of the upper shell according to one embodiment of the present application;

FIG. 7 is a schematic view showing the external structure of the upper shell according to one embodiment of the present application;

FIG. 8 is a schematic cross-sectional view of an upper shell in accordance with one embodiment of the present application;

FIG. 9 is a schematic view showing the internal structure of the lower shell according to an embodiment of the present application;

fig. 10 is a schematic view of a knob according to an embodiment of the present application.

In the figure: 1. a push rod; 2. a knob; 3. a housing; 4. a sheath tube joint; 5. a sheath; 6. a self-expanding device; 7. a dilator;

101. a limit groove; 102. a baffle; 103. a pushing handle; 201. a button cap; 202. a plate-shaped end; 203. a limit column; 301. an upper case; 302. a lower case; 303. a round hole; 304. a strip-shaped plate; 305. a clamping plate; 306. positioning pin posts; 307. and positioning holes.

Detailed Description

The following description of the technical solutions in the embodiments of the present application will be clear and complete, and it is obvious that the described embodiments are only some embodiments of the present application, but not all embodiments. All other embodiments, which are derived by a person skilled in the art based on the embodiments of the application, fall within the scope of protection of the application.

In the description of the present application, the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", etc. refer to the orientation or positional relationship based on that shown in the drawings, merely for convenience of description of the present application and do not require that the present application must be constructed and operated in a specific orientation, and thus should not be construed as limiting the present application. The terms "coupled" and "connected" as used herein are to be construed broadly and may be, for example, fixedly coupled or detachably coupled; either directly or indirectly through intermediate components, the specific meaning of the terms being understood by those of ordinary skill in the art as the case may be.

The application will be described in detail below with reference to the drawings in connection with embodiments. It should be noted that, without conflict, the embodiments of the present application and features of the embodiments may be combined with each other.

As shown in fig. 1-10, in this embodiment, the expander assembly is provided with a distal end at one end of the expander 7 extending into a blood vessel and a proximal end at the other end, and is suitable for a self-expanding device, and includes a push rod 1, a housing 3, a push button and the expander 7, where the push rod 1 is slidably assembled inside the housing 3, and is capable of sliding inside the housing 3, the expander 7 is correspondingly connected to the distal end of the push rod 1, along with pushing of the push rod 1, the expander 7 can be inserted into the blood vessel, a limit groove 101 is provided outside the push rod 1, a round hole 303 corresponding to the limit groove 101 is provided on the housing 3, the round hole 303 extends along a radial direction of the housing 3 and extends to the push rod 1, a knob 2 is provided in the round hole, and is driven by an external force to insert into the round hole 303, and when the knob 2 moves toward the push rod 1, the knob 2 is inserted into the limit groove 101 corresponding to one end of the push rod 1, so as to lock the push rod 1, and to increase the controllability of the expander 7 in the use process, thereby preventing the expander 7 from entering into a human body, and avoiding uncontrollable sliding damage to the vessel wall. The shell 3 can be cylindrical, can be used for holding by hand, can push the expander 7 through the push rod 1 according to actual operation demands in the operation process, and along with the relative movement of the push expander 7 and the shell 3, the self-expanding device 6 at the front end of the expander 7 is opened at a proper time.

In another alternative embodiment, the number of the limiting grooves 101 may be set according to the requirement, as an preference, the limiting grooves 101 are two, the two limiting grooves 101 are distributed in the same axial direction of the pushing rod 1, the distance between the two limiting grooves 101 is set according to the actual requirement, specifically, the distance between the two limiting grooves 101 is matched with the pushing distance of the pushing rod 1 in the venous thrombus taking operation, the knob 2 is switched between the two limiting grooves 101 along with pushing of the pushing rod 1, before the operation, the knob 2 and the limiting grooves 101 at the far end of the pushing rod 1 are clamped with each other, the stability is maintained in the inserting process of the expander 7, when the expander 7 is sent to the designated position, the knob 2 and the limiting grooves 101 at the near end of the pushing rod 1 are clamped, and at this time, the self-expanding device 6 at the front end of the expander 7 is opened.

In another alternative embodiment, a guide rail corresponding to the push rod 1 is arranged on the inner wall of the shell 3, so that the push rod 1 can slide along the guide rail, a push path of the push rod 1 is limited, a baffle plate 102 is arranged on the push rod 1, the baffle plate 102 is arranged on one side far away from the limit groove 101, and a chute corresponding to the baffle plate 102 is arranged on the guide rail, so that the baffle plate 102 can be limited, the push rod 1 is prevented from rotating relative to the shell 3, and the limit groove 101 is opposite to the knob 2; when the push rod is specifically used, the baffle 102 is blocked at the proximal end of the guide rail, the knob 2 is opposite to the limit groove 101 at the distal end, the push rod 1 and the expander 7 are limited in the pushing process, when the baffle 102 is blocked at the distal end of the guide rail, the knob 2 is opposite to the limit groove 101 at the proximal end, and the pusher is located at a designated position.

In another alternative embodiment, the limiting groove 101 is that the limiting groove 101 is perpendicular to the axial direction of the push rod 1, and the end part of the knob 2 is provided with a corresponding plate-shaped end 202, so that when the plate-shaped end 202 is clamped into the limiting groove 101, good limiting is performed, and the push rod 1 is prevented from shaking in the axial direction of the housing 3.

In another alternative embodiment, a stepped platform is arranged in the round hole 303, the stepped platform is arranged at one end of the round hole 303 far away from the push rod 1, a limiting column 203 extending radially is arranged in the middle of the knob 2, a spring positioned between the limiting column 203 and the stepped platform is sleeved on the knob 2, the spring has a certain thrust, the knob 2 has a driving force for moving towards the limiting groove 101, and when the push rod is used, the knob 2 can be locked by contact through external force pulling. In an embodiment, the plate-shaped end 202 is provided with an arc-shaped notch at one end corresponding to the push rod 1, the arc-shaped notch is matched with the outer diameter of the push rod 1, and when in use, the push rod 1 can be limited to a certain extent, so that the push rod 1 and the housing 3 are kept concentric. In another embodiment, two limiting plates may be provided on the upper case 301, and a spring may be provided between one limiting plate far from the push rod 1 and the limiting post 203.

In this embodiment, the inner wall of the circular hole 303 is provided with a clamping plate 305 corresponding to the limiting post 203, the upper end of the clamping plate 305 extends along the length direction of the circular hole 303, the lower end of the clamping plate 305 is bent towards the inner wall of the circular hole 303 and connected with the inner wall of the circular hole 303, and the clamping plate 305 and the housing 3 can be integrally formed. The clamping plate 305 is provided with a notch corresponding to the limiting column 203, the knob 2 is pulled to enable the limiting column 203 to move to the upper side of the clamping plate 305 after overcoming the spring force, the limiting column 203 is clamped in the notch through rotation, and the knob 2 is axially positioned, so that the device is kept in a unlocking state. The notch may be an arc notch adapted to the outer diameter of the limiting post 203, so that the limiting post 203 is relatively stable.

In this embodiment, a knob cap 201 is detachably connected to an end of the knob 2 away from the limiting groove 101, and during the assembly stage of the device, the knob 2 penetrates out from inside to outside and then is connected to the knob cap 201, and a receiving groove corresponding to the knob cap 201 is provided on the housing 3.

In another alternative embodiment, a pushing handle 103 is arranged at the proximal end of the pushing rod 1, the pushing handle 103 comprises two opposite page plates distributed on the pushing rod 1, a luer connector is arranged at the proximal end of the pushing rod 1, the luer connector is a standard part, and the pushing handle can be detachably connected with a medical hose such as an injection catheter, and can be used for injecting medicine liquid or preventing blood leakage during operation. The expander 7 is correspondingly inserted into the distal end of the push rod 1 and is fixedly connected with the push rod 1 through glue.

In another alternative embodiment, the sheath 5 is sleeved outside the part of the expander 7 extending out of the distal end of the housing 3, the sheath 5 is correspondingly connected to the distal end of the housing 3 through the sheath connector 4, the inner diameter of the sheath 5 is larger than the outer diameter of the expander 7, the self-expansion device 6 is arranged at the distal end of the expander 7, when the knob 2 is locked in the limit groove 101 at the distal end of the push rod, the self-expansion device 6 moves along with the expander 7 and is retracted into the sheath 5, and is particularly positioned in a gap between the sheath 5 and the expander 7, so that the self-expansion device 6 is retracted in the process that the expander 7 extends into a blood vessel, and the difficulty of the expander extending into the blood vessel is reduced; with the push knob 2 of the push rod 1 locked in the proximal locking position, the self-expanding device 6 moves with the dilator 7 out of the distal end of the sheath 5, thereby disengaging the sheath 5 and expanding, creating a support within the vessel for further surgical procedures. In the present embodiment, although the shape of the self-expanding device 6 is shown as a tapered catheter, the shape is not limiting to the present application, and the self-expanding device 6 may be a variable diameter catheter having a nonuniform diameter after release, particularly a catheter having a maximum diameter at a distal end portion, for example, a tapered shape, a horn-like tube, or the like, and the shape of the self-expanding device 6 is not limited here.

The distal end of shell 3 is equipped with the interface that corresponds sheath coupling 4, sheath coupling 4 connects on the interface with detachable mode, in order to guarantee the connection stability of interface and sheath coupling 4, the interface outside is equipped with annular arch, the hole diameter of sheath coupling 4 reduces gradually in the direction that corresponds the distal end, the hole of sheath coupling 4 is the loudspeaker form or the toper structure that the big end corresponds the proximal end promptly, the minimum department (the distal end of hole) in hole aperture is equipped with the bellied ring channel of corresponding annular, when carrying out sheath 5 interface installation, cup joint sheath coupling 4 in interface department, and press through external force and make ring channel and the bellied gomphosis of annular, thereby realize the installation of sheath coupling 4, guarantee the stability after the installation of sheath coupling 4.

In another alternative embodiment, the main body of the casing 3 includes two halves that are spliced together, the two halves are spliced to realize the detachable operation, when the expander 7 and the self-expansion device 6 are placed at a designated position, the casing 3 can be disassembled to facilitate the subsequent operation, the round hole 303 is arranged on one of the halves, a plurality of positioning holes 307 are arranged on the other half, a plurality of positioning pins 306 are correspondingly arranged on the other half, when the casing 3 is spliced, the two halves are fixed through butt joint of the positioning pins 306 and the lower casing 302, in one embodiment, the two halves are respectively an upper casing 301 and a lower casing 302, and are arranged on the upper casing 301, and a plurality of positioning holes 307 are arranged on the upper casing 301, a plurality of positioning pins 306 are correspondingly arranged on the lower casing 302, and when the casing 3 is spliced, the upper casing 301 and the lower casing 302 are connected through butt joint of the positioning pins 306; in the present embodiment, the number of the positioning pins 306 or the positioning holes 307 may be 4, 6, or 8. In some embodiments, two strip-shaped plates 304 are disposed in the middle of each bisecting part, the strip-shaped plates 304 extend to the outer wall of the pushing rod 1, an arc-shaped surface opposite to the outer wall of the pushing rod 1 is disposed at the side part of the strip-shaped plates 304 to form a guide rail, a plurality of positioning pins 306 are distributed on two sides of the lower shell 302 corresponding to the guide rail, a plurality of positioning holes 307 are distributed on two sides of the upper shell 301 corresponding to the guide rail, and preferably, the number of the positioning pins 306 or the positioning holes 307 is 6. In one embodiment, the circular hole 303 of the assembly knob 2 is located in the upper shell 301, and the baffle 102 is adapted to the gap between the two strip-shaped plates 304 of the lower shell 302.

In another alternative embodiment, during assembly, the main body of the knob 2 is penetrated into the round hole 303 from inside to outside, the limiting column 203 is clamped by the clamping plate 305, and then the upper shell 301 and the lower shell 302 are correspondingly wrapped with the push rod 1, so that the limiting groove 101 is positioned at one side of the round hole 303; before operation, it is necessary to ensure that the whole expander 7 assembly is mutually locked, namely, the plate-shaped end 202 is kept clamped in the limiting groove 101, the spring is in a free state at the moment, the push rod 1 and the pusher shell 3 are kept in a locking state, the damage to the vascular wall in the process that the expander 7 enters a human body is avoided, the operation is prevented, after the distal end of the expander 7 reaches a designated position, the knob 2 is firstly forced to pull the compression spring upwards until the spring cannot be compressed, the knob 2 is rotated by 90 degrees anticlockwise, the limiting column 203 is clamped in a notch in the middle of the clamping plate 305 by means of the rebound force of the spring, at the moment, the knob 2 is separated from the limiting groove 101, and the push rod 1 and the pusher shell 3 are unlocked; the pushing rod 1 is moved distally along the track until the stop block is tightly attached to the distal end of the inner cavity of the shell 3, and then the self-expansion device 6 at the distal end of the sheath tube 5 is released, and the self-expansion device 6 can prevent thrombus fragments from being generated in the operation process and cause distal embolism along the blood; the knob 2 is pulled forcibly, and rotated 90 degrees clockwise, so that the limiting column 203 gets rid of the clamping plate 305, the knob 2 is released, the plate-shaped end 202 enters the limiting groove 101 by the resilience force of the spring, and the push rod 1 is locked; the pusher housing 3 is then grasped and the pusher housing 3 is pulled out of the sheath connector 4 with a force of 10-15N, thereby removing the dilator 7 and continuing the procedure. It is to be understood that the above description is intended to be illustrative, and that the embodiments of the present application are not limited thereto.

The foregoing description of the preferred embodiments of the application is not intended to limit the application to the particular embodiments disclosed, but on the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the application as defined by the appended claims.

Claims (4)

1. An expander assembly suitable for a self-expanding device comprises a push rod, a shell, a push button and an expander, and is characterized in that,

the pushing rod is slidably assembled in the shell, and the expander is correspondingly connected to the distal end of the pushing rod; the outer part of the expander extending out of the far end of the shell is sleeved with a sheath pipe, and the sheath pipe is correspondingly connected to the far end of the shell through a sheath pipe joint;

a self-expanding device is arranged at the distal end of the dilator, the self-expanding device moves along with the dilator and is retracted into the sheath,

or the self-expanding device moves with the dilator out of the sheath and expands;

the push rod is provided with a limiting groove at the outer part, a round hole corresponding to the limiting groove is formed in the shell, a knob is arranged in the round hole, and one end of the knob corresponding to the push rod under the driving of external force is inserted into the limiting groove so as to lock the push rod;

the number of the limiting grooves is two, the distance between the two limiting grooves is matched with the pushing distance of the pushing rod in the venous thrombosis removing operation, and the knob is switched between the two limiting grooves along with pushing of the pushing rod; the inner wall of the shell is provided with a guide rail corresponding to the pushing rod, and one side of the pushing rod, which is far away from the limit groove, is provided with a baffle plate corresponding to the guide rail;

when the baffle is blocked at the proximal end of the guide rail, the knob is opposite to the limit groove at the distal end;

when the baffle is blocked at the far end of the guide rail, the knob is opposite to the limit groove at the near end;

a stepped platform is arranged in the round hole, a limit column extending radially along the middle of the knob is arranged, and a spring positioned between the limit column and the stepped platform is sleeved on the knob, so that the knob has a driving force for moving towards the limit groove;

one end of the platy end head corresponding to the pushing rod is provided with an arc notch which is matched with the outer diameter of the pushing rod,

the inner wall of the round hole is provided with a clamping plate corresponding to the limit column, the upper end of the clamping plate extends along the length direction of the round hole, the lower end of the clamping plate is bent towards the inner wall of the round hole and is connected with the inner wall of the round hole, and the clamping plate is provided with a notch corresponding to the limit column;

the main body of the shell comprises two equal parts which are spliced with each other, two strip-shaped plates are arranged in the middle of each equal part, the strip-shaped plates extend to the outer wall of the push rod, and arc-shaped surfaces for the outer wall of the push rod are arranged on the side parts of the strip-shaped plates to form a guide rail; the limiting groove is perpendicular to the axial direction of the pushing rod, and the end part of the knob is provided with a plate-shaped end head corresponding to the plate-shaped end head.

2. The dilator assembly for a self-expanding apparatus according to claim 1, wherein a push handle is provided at a proximal end of the push rod.

3. A dilator assembly for a self-expanding apparatus according to claim 1 wherein,

the outer shell is characterized in that the far end of the outer shell is provided with an interface corresponding to the sheath pipe joint, an annular protrusion is arranged outside the interface, the diameter of an inner hole of the sheath pipe joint is gradually reduced in the direction corresponding to the far end, and an annular groove corresponding to the annular protrusion is arranged at the far end of the inner hole.

4. The expander assembly suitable for use in a self-expanding device according to claim 1, wherein the body of the housing comprises two halves that are joined to each other, the circular aperture being provided in one of the halves;

one of the equal parts is provided with a plurality of positioning holes, and the other equal part is correspondingly provided with a plurality of positioning pins.